PPDU Header Segmentation for Spoofing Error Minimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless local area network (WLAN) systems, particularly in the IEEE 802.11ay standard, there is a challenge in minimizing the 'spoofing error' when transmitting and receiving physical protocol data units (PPDUs) between stations capable of decoding all fields and those capable of decoding only some fields, which affects compatibility and data integrity.
Innovation Solution
A method and device that calculate and set the number of single carrier (SC) blocks and training length in the PPDU header to ensure compatibility, involving the calculation of NBLKS' and NTRN values based on the modulation and coding scheme, to minimize the spoofing error by adjusting the transmission and reception of PPDU components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a PPDU is transmitted with a structure optimized for stations capable of decoding all fields, then the transmission efficiency and data rate are improved, but the compatibility with legacy stations capable of decoding only some fields deteriorates, leading to spoofing errors
Solution Approach 1:
The PPDU is divided into a first portion (legacy-compatible header) and a second portion (enhanced fields). The first portion is designed to be decodable by legacy stations, while the second portion contains additional information for advanced stations. This segmentation allows different station types to process appropriate portions without causing spoofing errors, maintaining both compatibility and transmission efficiency.
Solution Approach 2:
Different portions of the PPDU are designed with different quality characteristics. The first portion uses a structure and parameter set (NBLKS, NTRN) that ensures legacy stations can accurately estimate its length, while the second portion can utilize more advanced encoding schemes. This local differentiation allows each portion to be optimized for its intended receiver capability.
2Manufacturing precision
If the header field parameters (NBLKS, NTRN) are set to optimize for advanced 802.11ay functionality, then the data integrity for advanced stations is improved, but the length estimation accuracy for legacy stations deteriorates, causing spoofing errors
Solution Approach 1:
The first portion of the header is constructed in advance with parameters specifically designed to enable accurate length estimation by legacy stations. By preparing this legacy-compatible portion first, the system ensures that legacy stations can correctly estimate the PPDU length before encountering the enhanced second portion, preventing spoofing errors while allowing advanced functionality in the second portion.
Solution Approach 2:
The first portion of the header acts as an intermediary between legacy stations and the enhanced second portion. It provides legacy stations with sufficient information to accurately estimate the overall PPDU length, serving as a bridge that allows legacy stations to coexist with advanced PPDU structures without causing length estimation errors.
3Ease of operation
If the PPDU structure uses a fixed format for legacy compatibility, then the ease of operation for legacy stations is improved, but the adaptability to support advanced 802.11ay features deteriorates
Solution Approach 1:
The PPDU structure implements a nested format where the first portion (legacy-compatible) contains a simplified structure that legacy stations can easily process, while the second portion (enhanced) is nested within or alongside it to provide advanced 802.11ay features. This nested arrangement allows legacy stations to operate with the outer structure while advanced stations can access both portions for enhanced functionality.
Solution Approach 2:
The PPDU structure is designed to be dynamic, where the first portion maintains a fixed, simple format for legacy compatibility, while the second portion can be dynamically configured to support various advanced 802.11ay features. This dynamic structure allows the system to adapt to different advanced functionality requirements while preserving legacy ease of operation.
Data Source
AI summary
Disclosed in the present specification are a method for transmitting and receiving a signal including a physical protocol data unit (PPDU) in a wireless LAN (WLAN) system and an apparatus therefor. Specifically, disclosed in the present specification are a method for transmitting and receiving a signal and an apparatus therefor, which, in a PPDU supported by a specific wireless LAN system, can minimize an overall length error (also known as “spoofing error”) of the PPDU that is assumed to occur between a station capable of decoding all fields in the PPDU and a station capable of decoding only some fields in the PPDU.